Electronic heater



FIG. 1 is a top front and left side perspective view of electronic heater showing my new design;

FIG. 2 is a top rear and left side perspective view of electronic heater showing my new design;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a right side elevational view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

Those portions of the illustrated design indicated by broken lines form no part of the claimed design. 

CLAIM The ornamental design for an electronic heater, as shown and described. 